軽金属

研究論文

アルミニウム製フィン材の親水性能に及ぼす皮膜組成と下地皮膜の影響

神谷憲一, 太田陽介, 向井良和, 畑中孝一

2000 年 50 巻 4 号 p. 147-151
発行日: 2000年
公開日: 2007/03/30

DOIhttps://doi.org/10.2464/jilm.50.147

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We studied the influence of the water-soluble resin content and the Cr weight of pretreatment on hydrophilicity of the coating with alkaline silicate of aluminum fin-stock. It was clarified that by increasing the water-soluble resin content to the coating with alkaline silicate, the surface coating morphology got roughed. Further, as the actual surface area of the coating increased, the hydrophilicity was improved. In the case of low Cr weight of pretreatment, the coating with alkaline silicate was easily dissolved. On the contrary, in the case of too high Cr weight, the surface coating morphology was flat, and the hydrophilicity was decreased. Therefore, Cr weight of pretreatment must be appropriate, in order that the hydrophilicity may be improved.

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ミッシュメタルとジルコニウムで強化したMg–Zn–Ca合金の高温強度

堀江俊男, 岩堀弘昭, 妹尾与志木, 粟野洋司

2000 年 50 巻 4 号 p. 152-156
発行日: 2000年
公開日: 2007/03/30

DOIhttps://doi.org/10.2464/jilm.50.152

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Mischmetal and zirconium were added to the Mg–Zn–Ca alloy in order to strengthen. The high-pressure die castings of this alloy have higher ultimate strength than 200 MPa between room temperature and 150°C. The minimum creep rate of the gravity die-castings of this alloy is lower than that of QE22–T6 below 100 MPa at 150°C. Fine precipitate with a size of 5 nm is found by TEM observation of the as-cast and T6–treated specimens. T6–treated specimen has higher precipitate density than the as-cast one. It is considered that the precipitate contributes to the improvement on mechanical properties.

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5052/2017アルミニウム合金摩擦圧接継手接合界面の機械的混合層と機械的性質

不破野裕崇, 加藤数良, 時末光

2000 年 50 巻 4 号 p. 157-161
発行日: 2000年
公開日: 2007/03/30

DOIhttps://doi.org/10.2464/jilm.50.157

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The mechanically mixed layer at a weld interface and the mechanical properties of dissimilar welded joints of 5052 aluminum alloy to 2017 aluminum alloy, which were made by using a brake type friction welding machine were examined with different welding conditions. The mechanically mixed layer is formed on the friction process, and it is observed at a weld interface all over. The thickness of the mechanically mixed layer decreased with increasing friction pressure, the mixed layer of the outside of joint became thinner than that at the center. The tensile strength of joints which were made with the friction pressure of above 45 MPa, which had an average thickness of 200 μm in mechanically mixed layer, showed 85% of 5052 aluminum alloy base metal. The breakage occurred at the softened area of 5052 aluminum alloy side. The impact strength of joints, which had an average thickness of 200 μm in mechanically mixed layer, were 70% of 5052 aluminum alloy base metal.

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Ti–15%V–3%Cr–3%Sn–3%Al合金の85K付近での熱伝導度と77Kでの比抵抗

池田勝彦, 小松伸也, 杉本隆史, 南山克己

2000 年 50 巻 4 号 p. 162-165
発行日: 2000年
公開日: 2007/03/30

DOIhttps://doi.org/10.2464/jilm.50.162

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Thermal conductivity at about 85 K, κ, and resistivity at liquid nitrogen temperature (LN), ρ_LN, of a Ti–15 mass%V–3 mass%Cr–3 mass%Sn–3 mass%Al (Ti–15–3) alloy in variously aged states were measured by steady state method and direct current 4-contacts method, respectively. Thermal conductivity at room temperature (RT) and about 85 K of the Ti–15–3 alloy specimens quenched from 1073 K was smaller than that of other titanium alloys and SUS304 stainless steel. Thermal conductivity at about 85 K was increased by accumulative isochronal aging (step heating) up to 823 K and by isothermal aging at 773 K, while resistivity at LN decreased with the aging. The increase and the decrease were ascribed to α precipitation. All values of thermal conductivity measured in the aged Ti–15–3 alloy were about a half of that of SUS304 stainless steel. Relationship between thermal conductivity at about 85 K and the average measuring temperature in steady state divided by the resistivity at LN was almost linear, and regressed equation was κ = 0.11(ρ_LN⁻¹T) −1.60, where the units are W·m⁻¹·K⁻¹ for κ, μΩ·m for ρ_LN and K for T.

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解説

アルミニウム合金の摩擦撹拌接合と構造物への適用

岡村久宣, 青田欣也, 江角昌邦

2000 年 50 巻 4 号 p. 166-172
発行日: 2000年
公開日: 2007/03/30

DOIhttps://doi.org/10.2464/jilm.50.166

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連載講座

EPMA分析における検出限界とZAF補正

深町正利

2000 年 50 巻 4 号 p. 179-182
発行日: 2000/04/30
公開日: 2021/06/30

DOIhttps://doi.org/10.2464/jilm.50.179

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